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So far we have created a play field

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and a Player game object

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and we have the player moving

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under our control.

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In this lesson we'll create

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the collectable objects

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for our player to pick up.

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First open the Sprites folder.

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Drag the sprite Pickup

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in to the hierarchy.

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You'll notice after dragging in

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the Pickup sprite that we

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still can't see it.

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That's because it's being rendered

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behind both the Player

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and Background sprites.

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To bring it forward we

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need to set the sorting layer

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in the sprite renderer component.

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Set the sorting layer to Pickups.

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Now the Player game object

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is still in the way.

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This is because the Player

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sorting layer is in front

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of the Pickups sorting layer.

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Let's temporarily deactivate

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the Player game object.

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Select the Player game object

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and deselect the checkbox

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in front of the Name field.

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This is the game object's Active checkbox.

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Deselecting it will deactivate

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the game object in the scene.

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This will give us a clear working space

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for our new pickup object

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which we can now see.

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Focus the scene view camera on the

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pickup object by highlighting it

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and pressing the F key whilst

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the cursor is over the scene view.

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So that we can collide with the pickup

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let's add a circle collider 2D

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component to it.

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With the pickup highlighted click

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Add Component - Physics 2D

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then Circle Collider 2D.

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Adjust the Radius property

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of the circle collider 2D

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so that it fits the sprite artwork visually b

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by dragging in the Radius field.

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To be effective the collectable

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must attract the attention of the player.

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So let's make the object more attractive.

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There's one thing I feel certainly

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attracts the attention of a player

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and that is movement.

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So let's rotate our pickup.

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One way to do this is with a script.

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With the pickup object still selected

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use the Add Component button

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in the inspector.

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Let's create a new script called Rotator.

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Click Create and Add to confirm

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and let's organise the script by

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placing it in the Scripts folder.

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Open the Scripts folder and

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double click to open it for editing.

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We want the sprite to spin and we want

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to do it with this script.

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Let's remove the sample code

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we don't need.

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We will not be using forces

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so we can use Update

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rather than Fixed Update.

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We want to rotate the object every frame.

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To make the pickups spin we

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don't want to set the transform rotation

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but we want to rotate the transform.

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Type Transform inside Update.

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Select it and hold down the

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control key on windows or the command

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key on mac and type '

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Again this brings up the page

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with a search term Transform.

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Select Transform.

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Scroll down until you see Transform's public functions.

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There are two main ways to affect the transform.

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These are Translate and Rotate.

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Translate moves the game object

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using it's transform.

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Rotate rotates the game object

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using it's transform.

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We will use rotate.

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So let's click on the link.

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This brings up the page for Transform.Rotate.

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Note again the two signatures.

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One is using a vector3

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and the other is using 3

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float values for X, Y or Z.

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Both have the optional parameter

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Space which we will

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leave at default for this lesson.

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Again we will choose the most simple

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form that only uses the vector3 for direction.

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Let's return to our code.

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After transform,

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making sure that transform is written to

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begin with a lowercase t,

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write .rotate (new Vector3 (0, 0, 45))

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This means we'll rotate

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around the Z axis.

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Now this action also needs

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to be smooth and frame rate independent

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so we need to multiply the vector3 value

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by Time.deltaTime.

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It is worth noting that even

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though we are working with a 2D

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sprite we are using a vector3

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to rotate the collectable's transform.

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This is because the transform

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of the 2D sprite

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still exists in the 3D volume.

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When using the transform component

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with 2D objects we simply

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ignore the axis we don't need.

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Now that we are done with our Rotator script

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save this script and return to Unity.

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Let's test by entering play mode.

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And we can see our pickup object rotates.

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Let's exit play mode.

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Okay, we have the start of a working

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pickup object.

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Next we want to place these pickups

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around the game area.

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But before we do this we need to do

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one important step.

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We need to make our pickup object

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in to a prefab.

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Remember, a prefab is an

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asset that contains a template

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or blueprint of a game object

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or game object family.

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We create a prefab from an

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existing game object or game object family

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and once we create it

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we can use it in any scene

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in our current project.

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With a prefab of our pickup object

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we will be able to make changes to

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a single instance in our scene

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or to the prefab asset itself.

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And all of the pickup objects in our

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game will be updated with those changes.

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You'll notice we already have a folder

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to hold our prefabs.

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Let's drag the Pickup game object

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from our hierarchy and place

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it in to our Prefabs folder.

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When we drag and item from our hierarchy

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in to our project view

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we create a new prefab

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asset in our project.

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Before we spread our collectables

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around the game area we should create

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a new game object

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to hold our pickups and

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to help organise our hierarchy.

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Let's create a new game object.

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And call it Pickups.

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Check the transform to make sure our

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Pickups holder object

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is at origin, or (0, 0, 0).

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And if not use the component

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context menu to reset it.

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Next drag our Pickup game object on to it.

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Now we want to spread a

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number of these pickup objects

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around the play area.

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Make sure the pickup game object is

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selected, and not the parent.

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Now let's back out a little

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so we can see the entire game area.

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Click and drag the pickup game object

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to move it in to the

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first pickup position.

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I'm going to place mine at the top of the playing area.

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With the game object still selected

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duplicate it.

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This can be done either by selecting

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Edit - Duplicate, or by using the hot key combination.

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This is command-D on mac,

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or control-D on windows.

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Now let's position the

0:08:42.895,0:08:44.895
second instance of the prefab.

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Using the hot keys we will

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create a few more, placing them

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around the play area.

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Okay, I've created 12.

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Let's hit play and test.

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Excellent, these pickup prefabs

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are working great.

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In the next assignment we'll learn how to

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pick them up and to count them.